""Studies On The Life History Of Protozoa"" is a scientific book written by Gary Nathan Calkins in 1902. The book focuses on the life cycle and biology of protozoa, a group of single-celled organisms that play a crucial role in the ecosystem. The author delves into the various types of protozoa and their characteristics, including their morphology, physiology, and behavior. The book also explores the reproduction and development of protozoa, as well...